<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
var maxProfit = function(prices) {
    var sum = 0
    for( var i = 1 ; i<prices.length ; i++ ){
        if( prices[i] > prices[i-1] ){
            sum = sum + ( prices[i] - prices[i-1] )
        }
    }
    return sum
};
var prices = [7,1,5,3,6,4]
console.log(maxProfit(prices))
    </script>
</body>
</html>